Hollow-bolt construction.



C. H. ATKiNS. HOLLOW BOLT CONSTRUCTION APPLICATION man APR.22.1916.

Patented. Feb. 20, 1917.

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CHARLES HENRY ATKINS, 015 SPRINGFIELD, MA$SACHUSETTS.

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Specification of Letters Patent. Pat erned Feb, 2(1), 191%,

Application filed April 22, 1916. Serial No. 93,035.

To all whom it may concern:

Be it known that T, CHARLns HENRY AT- Kins, a citizen of the UnitedStates of America, residing in the city of Springfield, county ofHampden, and State of Massachusetts, have invented a new and usefulimprovement in Hollow-Bolt Constructions, of which the following is aspecification.

This invention relates to improvements in drying machines, either forcloth, paper or the like. In drying machines it is important that thebearings and packings are kept steam and water tight, not only toincrease the production and output but also to lessen the cost ofrepairs and increase the efficiency of the plant as a whole.

The present invention relates to improvements for carrying off the waterof condensation from the interior of a drying cylinder by means of adischarge pipe which extends into the cylinder and having its open innerend terminating near the lower side of the cylinder, the outlet end ofthe pipe passin through a hollow bearing box by means of whichconstruction the drying medium, as steam, can enter the cylinder; meansis also provided to permit the ready withdrawal of the pipe from thedrying cylinder. A hollow bolt surrounds the pipe to provide a Vmeansfor forming a water and steam tight packing or oint between the box andits bearing. lidy present invention, in brief, therefore, is confined todevices and means for making a steam and water tight joint between thecylinder shaft and bearing, and, to permit the easy removal of thedischarge pipe from the cylinder when required.

The present invention is designed. to be used with the steam trap whichis shown, described and claimed in my copending application filed ofeven date herewith for an improvement in steam traps under Ser. No.93,034. r

Referring to the drawings which form a part of the present invention:

Figure 1 is a vertical sectional view of my improvement which isassociated with the hollow bearing for introducing steam into theheating drum, the hollow bolt construction, and the spider or packingring for forcing the joint packing material in place;

Fig. 2 is a detail view of a portion of the bearing box broken away andshowing the discharge pipe passing through the bearing into the dryingcylinder, the spider or ring for forcing the packing into place aboutthe shaft which supports and drives the drying cylinder.

Referring to the drawings in detail 1 designates the drying drum whichis suitably supported by means of the hollow shaft 2 that is driven inany suitable manner by means of the spur gear 3. The hollow bearing box4, into which steam is introduced, as indicated by the arrows 5 and 6,allows steam under pressure to flow into the cylinder 1 through thehollow shaft 2. Extending through the shaft 2 and into the dryingcylinder 1 is a discharge pipe 7, the inner end of which terminates nearthe lower side of the cylinder 1. Its outlet end passes through theshaft 2 and the hollow bolt 8 and the hub of the spider 9. This pipeserves the purpose of permitting the confined air in the cylinder 1 tobe driven out by the incoming steam. 10 designates a cap that isconnected to the bearing 41 by means of the threads 11. The hollow bolt8 passes through this cap and is connected thereto by means of thethreads 12. 13 is a nut that v is formed integral with the bolt 8 and bymeans of which the bolt may be rotated in the cap 12 by any suitablemeans, as a wrench. The inner end of this bolt engages the hub portion 11 of the spider 9. The arms of the spider are connected to a ring 15which in turn enters the annular opening 17 between the shaft 2 and thepacking box 4 for the purpose of forcing the packing material tightlyagainst the shaft 2 to pre vent leakage of steam or water. In order toprevent the escape of steam or water along the pipe 7, the stufling box18 is threaded on to the outer end of the hollow bolt 8 and suitablepacking material 19, is placed therein. The incoming steam enters thedrying cylinder 1 through the hollow bearing 4 and passes as indicatedby the arrow 6 through the arms 9 of the spider through the passageway20 into the cylinder 1. The air is driven out of the cylinder by meansof this incoming steam pressure and escapes through the pipe 7, asindicated by the arrows 21 to a suitable trap, or other device.

It will be seen that when the hollow bolt 8 is rotated in the cap 10 thering 15 is moved inward into the annular opening 17 to compress thepacking material therein.

In order to remove the pipe 7 and the spider and packing ring 15 fromthe cylinderl and the hollow bearing box 4: it is only place andforforcing the packing material into the joint between the hollowsupporting necessary to unscrew the cap 10, when both can be withdrawn.

From this construction it will be seen that I have provided a simple andinexpensive device for holding the discharge pipe 7 in diameter than theinterior diameter of said shaft and extending through the bearing boxinto the drying cylinder, a cap having a threaded connection with thebearing box and a-threaded opening in the cap, said hollow bolt engagingthe threaded opening of the cap and through which bolt the outer end ofthe steam outlet pipe passes, a spider, a packing. ring connectedthereto and located at, the inner'end of the hollow bolt and throughwhich the steam outlet pipe passes,

. said bolt serving the purpose for engaging thespiderand forforcing thepacking ring against packing. material as the said bolt is screwed intothe cap and against the spider of-said ring, said material being locatedin an annulanpacking receiving chamber between: thehollow shaft and thebearing box, whereby when the hollow bolt is rotated in the concentricopening the packing material maybe-forced inward by the packing ring.

'2; Ina device of the kind described, the

combinati'onwith a drying cylinder, a dischargepipe-extending into andnear 'the.

lower side of the cylinder, a-hollow bearing box, a hollow shaft forsupporting said cylinderandithrough which the pipe passes to provide anannular space around said pipe 'to'permit'the entrance of a heatingmedium,

as steam, a hollow bolt having threads on its external surface, forengaging a threaded opening in the hollow bearing box, apackingring'adapted to be engaged by said bolt for forcing the ringinward and a 'stufiing box on the-end of thehollow bolt to preventtheescape of steam from the bearing box.

3. A'device of the kind described comprising, incombination, a bearingbox having an annular space to contain packing material, a

hollow'externally threaded bolt secured to the box by means of threadsin a cap on the box, a steam pipe passing through the bolt, a stufiingbox on the end of the bolt, a packing ring on the pipe comprising a ringportion, a hub, an arm connecting the hub and ring portion and adaptedto be engaged by the inner end of the bolt for forcing said ring portioninward toward. the box as the bolt is rotated in said cap for thepurpose of moving the packing material into said annular space betweenthe shaft in the box and said'box, as described.

4. The combination in a structure of the kind described with a hollowbearing box for admitting a heating medium thereto, of a hollow shaftfor supporting a drying cylinder to permit the heating medium to enterthe cylinder, a pipe of less diameter than the shaft and passing throughthe shaft, a cap secured to said box and having a threaded opening, ahollow bolt surrounding a portion of the pipe for supporting the same,and means operated by the bolt for forcing the packing material betweenthe shaft and the box.

5. In a device of the kind described, the combination with a metaldrying cylinder and a hollow bearing box, of a hollow shaft secured tothe drying cylinder and mounted in said box, there being an annularspace between the-inner end of said shaft and said box for placingpacking material of a compressible nature therein, a cap having screwthreads on its inner end for closing the outer end ofsaid box, the caphaving a threaded opening extending axially through the same to receivean externally threaded elongated hollow bolt structure, a steam outletpipe passing through the hollow shaft and hollow bolt, a ring located inthe annular space in which the packing material is located, the ringbeing connected to a hub through which the steam outlet pipe passes,arms for integrally connecting the ring and hub, the'inner end of thesaid bolt engaging the outer end of the hub, a squared portion on theouter end of said bolt for-the purpose of rotating the bolt for forcingthe ring against the packing material, a stufling box on the outer endof the hollow bolt, all constructed and arranged as and for the purposedescribed.

CHARLES HENRY ATKINS.

Witness HARRY W. Bownn.

Copies of this patent may De-obtained for five cents each-by addressingthe Commissioner of Patents, I Washington, D. 03

